On the morphological variability of Aulacoseira baicalensis and Aulacoseira islandica (Bacillariophyta) of Lake Baikal, Russia

Babanazarova, O. V.; Likhoshway, Ye. V.; Sherbakov, D. Yu.

doi:10.2216/i0031-8884-35-2-113.1

Cited by 26 publications

(17 citation statements)

References 3 publications

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“…shape of spines, structure and location of fultoportulae and rimoportulae, areols and alveols in the endemic species (Figs. 2 and 3) agree completely with taxonomic diagnoses (Genkal & Popovskaya, 1990, 1991Likhoshway et al, 1992;Babanazarova et al, 1996;Edlund et al, 1996;Popovskaya et al, 2002). S. meyerii is the exception, having fewer numbers of striae per 10 microns and spine appendages (Table 2).…”

Section: Resultssupporting

confidence: 56%

Are the Lake Baikal diatoms endemic?

Генкал

Бондаренко

2006

Hydrobiologia

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An electron-microscopy study of Aulacoseira baicalensis, A. islandica (A. skvortzowii), Cyclotella baicalensis, C. minuta, and Stephanodiscus meyerii in phytoplankton samples from some mountain lakes of Zabaikalye (an area north and east of Lake Baikal) shows that these algae possess morphological similarities with the algae inhabiting Lake Baikal, including some elements of their ultra-structure. We hypothesise that they were more widespread in the past and persist today in mountain lakes along the Baikal rift zone owing to certain features of their biology. We conclude that these baikalian diatom algae, previously regarded as endemic, should be re-assigned to relict status.

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Section: Resultssupporting

confidence: 56%

Are the Lake Baikal diatoms endemic?

Генкал

Бондаренко

2006

Hydrobiologia

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“…(Kozhov 1963;Kozhova et al 1982), Aulacoseira islandica (O.Müll.) Simonsen (Genkal andPopovskaya 1990b, 1991;Bradbury et al 1994;Flower et al 1995;Babanazarova et al 1996), A. islandica ssp. helvetica (O.Müll.)…”

Section: Resultsmentioning

confidence: 99%

A 200,000‐year, high‐resolution record of diatom productivity and community makeup from Lake Baikal shows high correspondence to the marine oxygen‐isotope record of climate change

Edlund

Stoermer

2000

Limnology & Oceanography

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Siliceous microfossil succession was analyzed in a 200,000‐yr sediment sequence recovered from the Buguldeika Saddle in Lake Baikal, Russia. Siliceous microfossil abundance varied among core depths from no preserved microfossils during inferred colder climate conditions to recent interglacial sediments containing over 300 × 106 microfossils per g dry sediment. Depth‐age microfossil assemblage zones (CA‐I to CA‐IV) identified using correspondence analysis had high correspondence to stages in the marine d18O isotope record and could be partially aligned with Late Pleistocene glacial‐interglacial cycling models from the mid‐Siberian Highland. These observations suggest that Lake Baikal phytoplankton communities have responded to climatic changes driven by insolation parameters and global ice volumes on temporal scales similar to tropical and polar oceans. Microfossil zone CA‐I (0–11.4 kyr B.P.) corresponded to the Holocene interglacial or d18O stage 1 (0–11.4 kyr B.P.), a period of higher production in Lake Baikal during a climatic optimum. Microfossil zone CA‐II (12.3–18.7 kyr B.P.) corresponded to the Sartan glaciation and d18O stage 2 (12–24 kyr B.P.). Zone CA‐III (21.3–73.2 kyr B.P.) comprised d18O stages 3 and 4. However, within zone CA‐III, subzones CA‐IIIa and IIIb (21.3–56.8 kyr B.P.) grouped were well aligned with d18O stage 3 and contained sediments deposited during the inferred Karginskiy interstade. Microfossil zone CA‐IVa (77.4–129.2 kyr B.P.) and CA‐IVb (130.3–172.5 kyr B.P.) included d18O stages 5 and 6, respectively, with sediments that were most likely deposited during the Taz glaciation and the Kazantsevo interstade. Climate‐induced changes are reflected in production differences and in community composition specificity within microfossil zones or climate stages. This suggests that climate change drives major historical successional patterns in Lake Baikal's primary producer community; changes in primary producers must have further impacted the system's entire biota.

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“…Archibald (1984) and Morales et al (2001) have pointed out that many ecological and monitoring studies are misleading, because identifications have not been verified by experienced diatom taxonomists. To identify diatoms morphologically beyond the genus level is difficult and requires expert knowledge, especially because frustule morphology can vary considerably even within a population (Babanazarova et al 1996;Bailey-Watts 1976;Jahn 1986;Medlin et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Barcoding diatoms: evaluation of the V4 subregion on the 18S rRNA gene, including new primers and protocols

2011

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Diatoms are present in all types of water bodies and their species diversity is influenced greatly by environmental conditions. This means that diatom occurrence and abundances are suitable indicators of water quality. Furthermore, continuous screening of algal biodiversity can provide information about diversity changes in ecosystems. Thus, diatoms represent a desirable group for which to develop an easy to use, quick, efficient, and standardised organism identification tool to serve routine water quality assessments. Because conventional morphological identification of diatoms demands specialised indepth knowledge, we have established standard laboratory procedures for DNA barcoding in diatoms. We (1) identified a short segment (about 400 bp) of the SSU (18S) rRNA gene which is applicable for the identification of diatom taxa, and (2) elaborated a routine protocol including standard primers for this group of microalgae. To test the universality of the primer binding sites and the discriminatory power of the proposed barcode region, 123 taxa, representing limnic diatom diversity, were included in the study and identified at species level. The effectiveness of the barcode was also scrutinised within a closely related species group, namely the Sellaphora pupula taxon complex and relatives.

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On the morphological variability of Aulacoseira baicalensis and Aulacoseira islandica (Bacillariophyta) of Lake Baikal, Russia

Cited by 26 publications

References 3 publications

Are the Lake Baikal diatoms endemic?

Are the Lake Baikal diatoms endemic?

A 200,000‐year, high‐resolution record of diatom productivity and community makeup from Lake Baikal shows high correspondence to the marine oxygen‐isotope record of climate change

Barcoding diatoms: evaluation of the V4 subregion on the 18S rRNA gene, including new primers and protocols

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